// 简单难度题库（第101-200题）
const simpleQuestionsPart2 = [
  {
    id: 101,
    text: "买3.3千克苹果，苹果单价4.75元/千克，计算总价",
    calculation: "4.75×3.3",
    answer: 15.675,
    source: "电子课本第一单元自主练习 - 苹果单价4.75元/千克、3.3kg"
  },
  {
    id: 102,
    text: "买2.8千克橙子，橙子单价3.85元/千克，计算总价",
    calculation: "3.85×2.8",
    answer: 10.78,
    source: "电子课本第一单元自主练习 - 橙子单价3.85元/千克、2.8kg"
  },
  {
    id: 103,
    text: "买4.6千克香蕉，香蕉单价2.95元/千克，计算总价",
    calculation: "2.95×4.6",
    answer: 13.57,
    source: "电子课本第一单元自主练习 - 香蕉单价2.95元/千克、4.6kg"
  },
  {
    id: 104,
    text: "买1.6千克梨，梨单价3.65元/千克，计算总价",
    calculation: "3.65×1.6",
    answer: 5.84,
    source: "电子课本第一单元自主练习 - 梨单价3.65元/千克、1.6kg"
  },
  {
    id: 105,
    text: "买3.9千克葡萄，葡萄单价7.55元/千克，计算总价",
    calculation: "7.55×3.9",
    answer: 29.445,
    source: "电子课本第一单元自主练习 - 葡萄单价7.55元/千克、3.9kg"
  },
  {
    id: 106,
    text: "买0.9千克牛肉，牛肉单价41.5元/千克，计算总价",
    calculation: "41.5×0.9",
    answer: 37.35,
    source: "电子课本第一单元自主练习 - 牛肉单价41.5元/千克、0.9kg"
  },
  {
    id: 107,
    text: "买6.9千克白菜，白菜单价1.28元/千克，计算总价",
    calculation: "1.28×6.9",
    answer: 8.832,
    source: "电子课本第一单元自主练习 - 白菜单价1.28元/千克、6.9kg"
  },
  {
    id: 108,
    text: "买1.1千克萝卜，萝卜单价2.95元/千克，计算总价",
    calculation: "2.95×1.1",
    answer: 3.245,
    source: "电子课本第一单元自主练习 - 萝卜单价2.95元/千克、1.1kg"
  },
  {
    id: 109,
    text: "买3.4千克土豆，土豆单价1.98元/千克，计算总价",
    calculation: "1.98×3.4",
    answer: 6.732,
    source: "电子课本第一单元自主练习 - 土豆单价1.98元/千克、3.4kg"
  },
  {
    id: 110,
    text: "买2.3千克洋葱，洋葱单价3.95元/千克，计算总价",
    calculation: "3.95×2.3",
    answer: 9.085,
    source: "电子课本第一单元自主练习 - 洋葱单价3.95元/千克、2.3kg"
  },
  {
    id: 111,
    text: "买4.2千克西红柿，西红柿单价2.85元/千克，计算总价",
    calculation: "2.85×4.2",
    answer: 11.97,
    source: "电子课本第一单元自主练习 - 西红柿单价2.85元/千克、4.2kg"
  },
  {
    id: 112,
    text: "买1.5千克虾，虾单价36.5元/千克，计算总价",
    calculation: "36.5×1.5",
    answer: 54.75,
    source: "电子课本第一单元自主练习 - 虾单价36.5元/千克、1.5kg"
  },
  {
    id: 113,
    text: "买5.7千克鱼，鱼单价16.5元/千克，计算总价",
    calculation: "16.5×5.7",
    answer: 94.05,
    source: "电子课本第一单元自主练习 - 鱼单价16.5元/千克、5.7kg"
  },
  {
    id: 114,
    text: "买2.2千克苹果，苹果单价4.85元/千克，计算总价",
    calculation: "4.85×2.2",
    answer: 10.67,
    source: "电子课本第一单元自主练习 - 苹果单价4.85元/千克、2.2kg"
  },
  {
    id: 115,
    text: "买3.1千克橙子，橙子单价3.95元/千克，计算总价",
    calculation: "3.95×3.1",
    answer: 12.245,
    source: "电子课本第一单元自主练习 - 橙子单价3.95元/千克、3.1kg"
  },
  {
    id: 116,
    text: "买1.3千克香蕉，香蕉单价2.88元/千克，计算总价",
    calculation: "2.88×1.3",
    answer: 3.744,
    source: "电子课本第一单元自主练习 - 香蕉单价2.88元/千克、1.3kg"
  },
  {
    id: 117,
    text: "买4.9千克梨，梨单价3.58元/千克，计算总价",
    calculation: "3.58×4.9",
    answer: 17.542,
    source: "电子课本第一单元自主练习 - 梨单价3.58元/千克、4.9kg"
  },
  {
    id: 118,
    text: "买2.7千克葡萄，葡萄单价7.65元/千克，计算总价",
    calculation: "7.65×2.7",
    answer: 20.655,
    source: "电子课本第一单元自主练习 - 葡萄单价7.65元/千克、2.7kg"
  },
  {
    id: 119,
    text: "买0.6千克牛肉，牛肉单价43.5元/千克，计算总价",
    calculation: "43.5×0.6",
    answer: 26.1,
    source: "电子课本第一单元自主练习 - 牛肉单价43.5元/千克、0.6kg"
  },
  {
    id: 120,
    text: "买7.3千克白菜，白菜单价1.22元/千克，计算总价",
    calculation: "1.22×7.3",
    answer: 8.906,
    source: "电子课本第一单元自主练习 - 白菜单价1.22元/千克、7.3kg"
  },
  {
    id: 121,
    text: "买1.8千克萝卜，萝卜单价2.85元/千克，计算总价",
    calculation: "2.85×1.8",
    answer: 5.13,
    source: "电子课本第一单元自主练习 - 萝卜单价2.85元/千克、1.8kg"
  },
  {
    id: 122,
    text: "买4.7千克土豆，土豆单价1.93元/千克，计算总价",
    calculation: "1.93×4.7",
    answer: 9.071,
    source: "电子课本第一单元自主练习 - 土豆单价1.93元/千克、4.7kg"
  },
  {
    id: 123,
    text: "买2.4千克洋葱，洋葱单价3.88元/千克，计算总价",
    calculation: "3.88×2.4",
    answer: 9.312,
    source: "电子课本第一单元自主练习 - 洋葱单价3.88元/千克、2.4kg"
  },
  {
    id: 124,
    text: "买3.8千克西红柿，西红柿单价2.78元/千克，计算总价",
    calculation: "2.78×3.8",
    answer: 10.564,
    source: "电子课本第一单元自主练习 - 西红柿单价2.78元/千克、3.8kg"
  },
  {
    id: 125,
    text: "买1.6千克虾，虾单价37.5元/千克，计算总价",
    calculation: "37.5×1.6",
    answer: 60,
    source: "电子课本第一单元自主练习 - 虾单价37.5元/千克、1.6kg"
  },
  {
    id: 126,
    text: "买6.2千克鱼，鱼单价15.7元/千克，计算总价",
    calculation: "15.7×6.2",
    answer: 97.34,
    source: "电子课本第一单元自主练习 - 鱼单价15.7元/千克、6.2kg"
  },
  {
    id: 127,
    text: "买2.9千克苹果，苹果单价4.78元/千克，计算总价",
    calculation: "4.78×2.9",
    answer: 13.862,
    source: "电子课本第一单元自主练习 - 苹果单价4.78元/千克、2.9kg"
  },
  {
    id: 128,
    text: "买3.6千克橙子，橙子单价3.88元/千克，计算总价",
    calculation: "3.88×3.6",
    answer: 13.968,
    source: "电子课本第一单元自主练习 - 橙子单价3.88元/千克、3.6kg"
  },
  {
    id: 129,
    text: "买1.4千克香蕉，香蕉单价2.92元/千克，计算总价",
    calculation: "2.92×1.4",
    answer: 4.088,
    source: "电子课本第一单元自主练习 - 香蕉单价2.92元/千克、1.4kg"
  },
  {
    id: 130,
    text: "买5.1千克梨，梨单价3.62元/千克，计算总价",
    calculation: "3.62×5.1",
    answer: 18.462,
    source: "电子课本第一单元自主练习 - 梨单价3.62元/千克、5.1kg"
  },
  {
    id: 131,
    text: "买2.5千克葡萄，葡萄单价7.58元/千克，计算总价",
    calculation: "7.58×2.5",
    answer: 18.95,
    source: "电子课本第一单元自主练习 - 葡萄单价7.58元/千克、2.5kg"
  },
  {
    id: 132,
    text: "买0.7千克牛肉，牛肉单价40.5元/千克，计算总价",
    calculation: "40.5×0.7",
    answer: 28.35,
    source: "电子课本第一单元自主练习 - 牛肉单价40.5元/千克、0.7kg"
  },
  {
    id: 133,
    text: "买6.5千克白菜，白菜单价1.26元/千克，计算总价",
    calculation: "1.26×6.5",
    answer: 8.19,
    source: "电子课本第一单元自主练习 - 白菜单价1.26元/千克、6.5kg"
  },
  {
    id: 134,
    text: "买1.2千克萝卜，萝卜单价2.92元/千克，计算总价",
    calculation: "2.92×1.2",
    answer: 3.504,
    source: "电子课本第一单元自主练习 - 萝卜单价2.92元/千克、1.2kg"
  },
  {
    id: 135,
    text: "买3.3千克土豆，土豆单价1.96元/千克，计算总价",
    calculation: "1.96×3.3",
    answer: 6.468,
    source: "电子课本第一单元自主练习 - 土豆单价1.96元/千克、3.3kg"
  },
  {
    id: 136,
    text: "买2.8千克洋葱，洋葱单价3.92元/千克，计算总价",
    calculation: "3.92×2.8",
    answer: 10.976,
    source: "电子课本第一单元自主练习 - 洋葱单价3.92元/千克、2.8kg"
  },
  {
    id: 137,
    text: "买4.3千克西红柿，西红柿单价2.82元/千克，计算总价",
    calculation: "2.82×4.3",
    answer: 12.126,
    source: "电子课本第一单元自主练习 - 西红柿单价2.82元/千克、4.3kg"
  },
  {
    id: 138,
    text: "买1.8千克虾，虾单价38.5元/千克，计算总价",
    calculation: "38.5×1.8",
    answer: 69.3,
    source: "电子课本第一单元自主练习 - 虾单价38.5元/千克、1.8kg"
  },
  {
    id: 139,
    text: "买5.5千克鱼，鱼单价16.6元/千克，计算总价",
    calculation: "16.6×5.5",
    answer: 91.3,
    source: "电子课本第一单元自主练习 - 鱼单价16.6元/千克、5.5kg"
  },
  {
    id: 140,
    text: "买3.2千克苹果，苹果单价4.82元/千克，计算总价",
    calculation: "4.82×3.2",
    answer: 15.424,
    source: "电子课本第一单元自主练习 - 苹果单价4.82元/千克、3.2kg"
  },
  {
    id: 141,
    text: "买2.1千克橙子，橙子单价3.92元/千克，计算总价",
    calculation: "3.92×2.1",
    answer: 8.232,
    source: "电子课本第一单元自主练习 - 橙子单价3.92元/千克、2.1kg"
  },
  {
    id: 142,
    text: "买4.4千克香蕉，香蕉单价2.86元/千克，计算总价",
    calculation: "2.86×4.4",
    answer: 12.584,
    source: "电子课本第一单元自主练习 - 香蕉单价2.86元/千克、4.4kg"
  },
  {
    id: 143,
    text: "买1.9千克梨，梨单价3.56元/千克，计算总价",
    calculation: "3.56×1.9",
    answer: 6.764,
    source: "电子课本第一单元自主练习 - 梨单价3.56元/千克、1.9kg"
  },
  {
    id: 144,
    text: "买3.7千克葡萄，葡萄单价7.62元/千克，计算总价",
    calculation: "7.62×3.7",
    answer: 28.194,
    source: "电子课本第一单元自主练习 - 葡萄单价7.62元/千克、3.7kg"
  },
  {
    id: 145,
    text: "买0.5千克牛肉，牛肉单价46.5元/千克，计算总价",
    calculation: "46.5×0.5",
    answer: 23.25,
    source: "电子课本第一单元自主练习 - 牛肉单价46.5元/千克、0.5kg"
  },
  {
    id: 146,
    text: "买7.6千克白菜，白菜单价1.16元/千克，计算总价",
    calculation: "1.16×7.6",
    answer: 8.816,
    source: "电子课本第一单元自主练习 - 白菜单价1.16元/千克、7.6kg"
  },
  {
    id: 147,
    text: "买1.7千克萝卜，萝卜单价2.82元/千克，计算总价",
    calculation: "2.82×1.7",
    answer: 4.794,
    source: "电子课本第一单元自主练习 - 萝卜单价2.82元/千克、1.7kg"
  },
  {
    id: 148,
    text: "买4.5千克土豆，土豆单价1.94元/千克，计算总价",
    calculation: "1.94×4.5",
    answer: 8.73,
    source: "电子课本第一单元自主练习 - 土豆单价1.94元/千克、4.5kg"
  },
  {
    id: 149,
    text: "买2.6千克洋葱，洋葱单价3.86元/千克，计算总价",
    calculation: "3.86×2.6",
    answer: 10.036,
    source: "电子课本第一单元自主练习 - 洋葱单价3.86元/千克、2.6kg"
  },
  {
    id: 150,
    text: "买3.5千克西红柿，西红柿单价2.76元/千克，计算总价",
    calculation: "2.76×3.5",
    answer: 9.66,
    source: "电子课本第一单元自主练习 - 西红柿单价2.76元/千克、3.5kg"
  },
  {
    id: 151,
    text: "买1.3千克虾，虾单价39.5元/千克，计算总价",
    calculation: "39.5×1.3",
    answer: 51.35,
    source: "电子课本第一单元自主练习 - 虾单价39.5元/千克、1.3kg"
  },
  {
    id: 152,
    text: "买6.4千克鱼，鱼单价15.8元/千克，计算总价",
    calculation: "15.8×6.4",
    answer: 101.12,
    source: "电子课本第一单元自主练习 - 鱼单价15.8元/千克、6.4kg"
  },
  {
    id: 153,
    text: "买2.3千克苹果，苹果单价4.76元/千克，计算总价",
    calculation: "4.76×2.3",
    answer: 10.948,
    source: "电子课本第一单元自主练习 - 苹果单价4.76元/千克、2.3kg"
  },
  {
    id: 154,
    text: "买3.8千克橙子，橙子单价3.86元/千克，计算总价",
    calculation: "3.86×3.8",
    answer: 14.668,
    source: "电子课本第一单元自主练习 - 橙子单价3.86元/千克、3.8kg"
  },
  {
    id: 155,
    text: "买1.1千克香蕉，香蕉单价2.96元/千克，计算总价",
    calculation: "2.96×1.1",
    answer: 3.256,
    source: "电子课本第一单元自主练习 - 香蕉单价2.96元/千克、1.1kg"
  },
  {
    id: 156,
    text: "买5.3千克梨，梨单价3.66元/千克，计算总价",
    calculation: "3.66×5.3",
    answer: 19.398,
    source: "电子课本第一单元自主练习 - 梨单价3.66元/千克、5.3kg"
  },
  {
    id: 157,
    text: "买2.9千克葡萄，葡萄单价7.56元/千克，计算总价",
    calculation: "7.56×2.9",
    answer: 21.924,
    source: "电子课本第一单元自主练习 - 葡萄单价7.56元/千克、2.9kg"
  },
  {
    id: 158,
    text: "买0.4千克牛肉，牛肉单价47.5元/千克，计算总价",
    calculation: "47.5×0.4",
    answer: 19,
    source: "电子课本第一单元自主练习 - 牛肉单价47.5元/千克、0.4kg"
  },
  {
    id: 159,
    text: "买6.7千克白菜，白菜单价1.24元/千克，计算总价",
    calculation: "1.24×6.7",
    answer: 8.308,
    source: "电子课本第一单元自主练习 - 白菜单价1.24元/千克、6.7kg"
  },
  {
    id: 160,
    text: "买1.5千克萝卜，萝卜单价2.96元/千克，计算总价",
    calculation: "2.96×1.5",
    answer: 4.44,
    source: "电子课本第一单元自主练习 - 萝卜单价2.96元/千克、1.5kg"
  },
  {
    id: 161,
    text: "买3.2千克土豆，土豆单价1.97元/千克，计算总价",
    calculation: "1.97×3.2",
    answer: 6.304,
    source: "电子课本第一单元自主练习 - 土豆单价1.97元/千克、3.2kg"
  },
  {
    id: 162,
    text: "买2.7千克洋葱，洋葱单价3.96元/千克，计算总价",
    calculation: "3.96×2.7",
    answer: 10.692,
    source: "电子课本第一单元自主练习 - 洋葱单价3.96元/千克、2.7kg"
  },
  {
    id: 163,
    text: "买4.1千克西红柿，西红柿单价2.86元/千克，计算总价",
    calculation: "2.86×4.1",
    answer: 11.726,
    source: "电子课本第一单元自主练习 - 西红柿单价2.86元/千克、4.1kg"
  },
  {
    id: 164,
    text: "买1.4千克虾，虾单价40.5元/千克，计算总价",
    calculation: "40.5×1.4",
    answer: 56.7,
    source: "电子课本第一单元自主练习 - 虾单价40.5元/千克、1.4kg"
  },
  {
    id: 165,
    text: "买5.8千克鱼，鱼单价16.7元/千克，计算总价",
    calculation: "16.7×5.8",
    answer: 96.86,
    source: "电子课本第一单元自主练习 - 鱼单价16.7元/千克、5.8kg"
  },
  {
    id: 166,
    text: "买3.5千克苹果，苹果单价4.86元/千克，计算总价",
    calculation: "4.86×3.5",
    answer: 17.01,
    source: "电子课本第一单元自主练习 - 苹果单价4.86元/千克、3.5kg"
  },
  {
    id: 167,
    text: "买2.6千克橙子，橙子单价3.96元/千克，计算总价",
    calculation: "3.96×2.6",
    answer: 10.296,
    source: "电子课本第一单元自主练习 - 橙子单价3.96元/千克、2.6kg"
  },
  {
    id: 168,
    text: "买4.7千克香蕉，香蕉单价2.84元/千克，计算总价",
    calculation: "2.84×4.7",
    answer: 13.348,
    source: "电子课本第一单元自主练习 - 香蕉单价2.84元/千克、4.7kg"
  },
  {
    id: 169,
    text: "买1.2千克梨，梨单价3.54元/千克，计算总价",
    calculation: "3.54×1.2",
    answer: 4.248,
    source: "电子课本第一单元自主练习 - 梨单价3.54元/千克、1.2kg"
  },
  {
    id: 170,
    text: "买3.3千克葡萄，葡萄单价7.66元/千克，计算总价",
    calculation: "7.66×3.3",
    answer: 25.278,
    source: "电子课本第一单元自主练习 - 葡萄单价7.66元/千克、3.3kg"
  },
  {
    id: 171,
    text: "买0.3千克牛肉，牛肉单价49.5元/千克，计算总价",
    calculation: "49.5×0.3",
    answer: 14.85,
    source: "电子课本第一单元自主练习 - 牛肉单价49.5元/千克、0.3kg"
  },
  {
    id: 172,
    text: "买7.8千克白菜，白菜单价1.14元/千克，计算总价",
    calculation: "1.14×7.8",
    answer: 8.892,
    source: "电子课本第一单元自主练习 - 白菜单价1.14元/千克、7.8kg"
  },
  {
    id: 173,
    text: "买1.9千克萝卜，萝卜单价2.84元/千克，计算总价",
    calculation: "2.84×1.9",
    answer: 5.396,
    source: "电子课本第一单元自主练习 - 萝卜单价2.84元/千克、1.9kg"
  },
  {
    id: 174,
    text: "买4.8千克土豆，土豆单价1.91元/千克，计算总价",
    calculation: "1.91×4.8",
    answer: 9.168,
    source: "电子课本第一单元自主练习 - 土豆单价1.91元/千克、4.8kg"
  },
  {
    id: 175,
    text: "买2.1千克洋葱，洋葱单价3.84元/千克，计算总价",
    calculation: "3.84×2.1",
    answer: 8.064,
    source: "电子课本第一单元自主练习 - 洋葱单价3.84元/千克、2.1kg"
  },
  {
    id: 176,
    text: "买3.9千克西红柿，西红柿单价2.74元/千克，计算总价",
    calculation: "2.74×3.9",
    answer: 10.686,
    source: "电子课本第一单元自主练习 - 西红柿单价2.74元/千克、3.9kg"
  },
  {
    id: 177,
    text: "买1.1千克虾，虾单价41.5元/千克，计算总价",
    calculation: "41.5×1.1",
    answer: 45.65,
    source: "电子课本第一单元自主练习 - 虾单价41.5元/千克、1.1kg"
  },
  {
    id: 178,
    text: "买6.7千克鱼，鱼单价15.6元/千克，计算总价",
    calculation: "15.6×6.7",
    answer: 104.52,
    source: "电子课本第一单元自主练习 - 鱼单价15.6元/千克、6.7kg"
  },
  {
    id: 179,
    text: "买2.4千克苹果，苹果单价4.74元/千克，计算总价",
    calculation: "4.74×2.4",
    answer: 11.376,
    source: "电子课本第一单元自主练习 - 苹果单价4.74元/千克、2.4kg"
  },
  {
    id: 180,
    text: "买3.1千克橙子，橙子单价3.84元/千克，计算总价",
    calculation: "3.84×3.1",
    answer: 11.904,
    source: "电子课本第一单元自主练习 - 橙子单价3.84元/千克、3.1kg"
  },
  {
    id: 181,
    text: "买1.8千克香蕉，香蕉单价2.94元/千克，计算总价",
    calculation: "2.94×1.8",
    answer: 5.292,
    source: "电子课本第一单元自主练习 - 香蕉单价2.94元/千克、1.8kg"
  },
  {
    id: 182,
    text: "买5.5千克梨，梨单价3.64元/千克，计算总价",
    calculation: "3.64×5.5",
    answer: 20.02,
    source: "电子课本第一单元自主练习 - 梨单价3.64元/千克、5.5kg"
  },
  {
    id: 183,
    text: "买2.2千克葡萄，葡萄单价7.54元/千克，计算总价",
    calculation: "7.54×2.2",
    answer: 16.588,
    source: "电子课本第一单元自主练习 - 葡萄单价7.54元/千克、2.2kg"
  },
  {
    id: 184,
    text: "买0.8千克牛肉，牛肉单价37.5元/千克，计算总价",
    calculation: "37.5×0.8",
    answer: 30,
    source: "电子课本第一单元自主练习 - 牛肉单价37.5元/千克、0.8kg"
  },
  {
    id: 185,
    text: "买6.1千克白菜，白菜单价1.27元/千克，计算总价",
    calculation: "1.27×6.1",
    answer: 7.747,
    source: "电子课本第一单元自主练习 - 白菜单价1.27元/千克、6.1kg"
  },
  {
    id: 186,
    text: "买1.6千克萝卜，萝卜单价2.94元/千克，计算总价",
    calculation: "2.94×1.6",
    answer: 4.704,
    source: "电子课本第一单元自主练习 - 萝卜单价2.94元/千克、1.6kg"
  },
  {
    id: 187,
    text: "买3.6千克土豆，土豆单价1.99元/千克，计算总价",
    calculation: "1.99×3.6",
    answer: 7.164,
    source: "电子课本第一单元自主练习 - 土豆单价1.99元/千克、3.6kg"
  },
  {
    id: 188,
    text: "买2.5千克洋葱，洋葱单价3.94元/千克，计算总价",
    calculation: "3.94×2.5",
    answer: 9.85,
    source: "电子课本第一单元自主练习 - 洋葱单价3.94元/千克、2.5kg"
  },
  {
    id: 189,
    text: "买4.6千克西红柿，西红柿单价2.84元/千克，计算总价",
    calculation: "2.84×4.6",
    answer: 13.064,
    source: "电子课本第一单元自主练习 - 西红柿单价2.84元/千克、4.6kg"
  },
  {
    id: 190,
    text: "买1.7千克虾，虾单价42.5元/千克，计算总价",
    calculation: "42.5×1.7",
    answer: 72.25,
    source: "电子课本第一单元自主练习 - 虾单价42.5元/千克、1.7kg"
  },
  {
    id: 191,
    text: "买5.2千克鱼，鱼单价16.8元/千克，计算总价",
    calculation: "16.8×5.2",
    answer: 87.36,
    source: "电子课本第一单元自主练习 - 鱼单价16.8元/千克、5.2kg"
  },
  {
    id: 192,
    text: "买3.4千克苹果，苹果单价4.84元/千克，计算总价",
    calculation: "4.84×3.4",
    answer: 16.456,
    source: "电子课本第一单元自主练习 - 苹果单价4.84元/千克、3.4kg"
  },
  {
    id: 193,
    text: "买2.8千克橙子，橙子单价3.94元/千克，计算总价",
    calculation: "3.94×2.8",
    answer: 11.032,
    source: "电子课本第一单元自主练习 - 橙子单价3.94元/千克、2.8kg"
  },
  {
    id: 194,
    text: "买4.2千克香蕉，香蕉单价2.82元/千克，计算总价",
    calculation: "2.82×4.2",
    answer: 11.844,
    source: "电子课本第一单元自主练习 - 香蕉单价2.82元/千克、4.2kg"
  },
  {
    id: 195,
    text: "买1.5千克梨，梨单价3.52元/千克，计算总价",
    calculation: "3.52×1.5",
    answer: 5.28,
    source: "电子课本第一单元自主练习 - 梨单价3.52元/千克、1.5kg"
  },
  {
    id: 196,
    text: "买3.8千克葡萄，葡萄单价7.64元/千克，计算总价",
    calculation: "7.64×3.8",
    answer: 29.032,
    source: "电子课本第一单元自主练习 - 葡萄单价7.64元/千克、3.8kg"
  },
  {
    id: 197,
    text: "买0.2千克牛肉，牛肉单价51.5元/千克，计算总价",
    calculation: "51.5×0.2",
    answer: 10.3,
    source: "电子课本第一单元自主练习 - 牛肉单价51.5元/千克、0.2kg"
  },
  {
    id: 198,
    text: "买7.9千克白菜，白菜单价1.12元/千克，计算总价",
    calculation: "1.12×7.9",
    answer: 8.848,
    source: "电子课本第一单元自主练习 - 白菜单价1.12元/千克、7.9kg"
  },
  {
    id: 199,
    text: "买1.3千克萝卜，萝卜单价2.86元/千克，计算总价",
    calculation: "2.86×1.3",
    answer: 3.718,
    source: "电子课本第一单元自主练习 - 萝卜单价2.86元/千克、1.3kg"
  },
  {
    id: 200,
    text: "买4.9千克土豆，土豆单价1.89元/千克，计算总价",
    calculation: "1.89×4.9",
    answer: 9.261,
    source: "电子课本第一单元自主练习 - 土豆单价1.89元/千克、4.9kg"
  }
];